I had a crack at the bolt hole but it was in the lock mortis not to the outside. I decided to drill out the lock bolt hole, glue in a piece of a hickory ramrod, redrilling the hole would strengthen the area. Do all your crack gluing and fixing first if you decide to add a hickory dowel in the lock bolt hole.
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It is not an easy task re-drilling such a hole and have it come out in the right place so your lock bolt hits the threaded hole on the lock plate. I put the dowel in then ground an 11/32 screw sharp, threaded it into the lock plate and put the plate back in the mortis so the sharpened screw would mark the dowel where the hole needed to come out.
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I use a drilling spike to drill the hole in the right place after it was marked.
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With this set-up I got it right on the first try.